| Study of | Guess |
|---|
| religious faith, practice, and experience | |
| aging and the problems of age | |
| birds | |
| cancer and its treatment | |
| crime | |
| disorders of the nervous system | |
| earthquakes | |
| hearing | |
| heart and its action and diseases | |
| human social behavior | |
| humans | |
| life of past geological periods as known from fossil remains | |
| | Study of | Guess |
|---|
| living organisms and vital processes | |
| locating and resolution of temporal sequence of past events in time | |
| material remains of past human life and activities | |
| mental processes and behavior in humans | |
| radioactive substances and high-energy radiations | |
| skin and related diseases | |
| the origin, composition, and therapeutic use drugs | |
| the origin, history, and structure of the earth | |
| the stars influences on human affairs | |
| the structure, physiology, development, and classification of animals | |
| volcanoes | |
| word origins | |
|
Old and New Things 
Most Well-Known Countries on Sporcle 
US States: Hot or Cold
